Liquid Medication Dosing for Dogs & Cats

Stop guessing. Use our calculator to convert your pet’s weight and the medication concentration into a precise milliliter dose every time.

2x common dosing errors avoided with weight-based calculation
100% free, no sign-up, works offline

Dose Calculator

Enter your pet’s weight and the medication concentration. We’ll calculate the exact milliliters to administer.

mg / ml

Look for "mg/ml" on the bottle or syringe. Common values: 25, 50, 100, 150 mg/ml.

mg / kg

Check your vet’s instructions. Typical rates: 2–10 mg/kg for many common pet medications.

Quick Presets:

How to Use This Calculator

1

Weigh Your Pet

Use a digital scale if possible. For small cats or dogs, weigh yourself holding the pet, then subtract your own weight. Enter the weight in kilograms or pounds.

2

Find the Concentration

Check the medication bottle or syringe for “mg/ml.” This is the concentration. If it says 50 mg/ml, every 1 ml contains 50 mg of active ingredient.

3

Check the Prescribed Rate

Your vet’s instructions should include a dosage rate like “5 mg per kg.” If it says “give 1 ml per 5 kg,” you can still use the calculator by matching the concentration.

4

Calculate & Confirm

Press “Calculate Dose” and compare the result with your vet’s written instructions. When in doubt, call your clinic.

Safety Tips for Liquid Medications

Never Use Human Medications

Many human drugs are toxic to pets. Only administer medications specifically prescribed by your veterinarian for this pet.

Use the Correct Syringe

Oral syringes are marked in milliliters (ml). Do not use a kitchen spoon — it’s inaccurate and can lead to dangerous overdoses.

Shake Well If Required

Some liquid suspensions settle. Check the label. If it says “shake well,” do so for at least 10 seconds before drawing the dose.

Watch for Side Effects

After giving a new medication, monitor your pet for vomiting, diarrhea, lethargy, or loss of appetite. Contact your vet immediately if you notice anything unusual.

Frequently Asked Questions

What if my pet’s weight is between whole numbers?

Enter the exact decimal (e.g., 7.3 kg). The calculator handles fractions precisely. Most digital scales give readings to one decimal place.

Can I use this for pills or tablets?

This calculator is designed for liquid medications measured in milliliters. For tablets, follow your vet’s pill-splitting instructions. Never split tablets without veterinary approval.

My bottle says “mg” but no “ml.” What do I do?

Liquid medications always have a concentration in mg/ml. If you can’t find it, call your vet or the pharmacy that dispensed the medication. Do not guess.

Is this calculator approved by veterinarians?

This tool follows standard veterinary dosing formulas, but it is not a substitute for professional advice. Always confirm the dose with your veterinarian.